Cutting device



Sept. 28 1926.

G. E. PURPLE CUTTING DEVICE Filed June 17. 1925 3 Sheets-Sheet 1 Sept.28,- 1926. 1,601,414

G. E. PURPLE CUTTING DEVICE Filed June 17, 1925 3 Sheets-Sheet 2 Gang eE Fuzya/e Patented Sept. 28, 1926.

UNITED STA'iiES httlAii PATENT ()FFIQE.

GEORGE PURPLE, 01? LAGBANGE, 'I'LLI NOIS ASSIGNOR TO FLEXIBLE STEELLACING COMPANY, 61 CHICAGO, ILLINOIS, A COR'POBATION OF ILLINOIS. Y

CUTTING DEVI-CE.

Application filed June 17, 1925. Serial No. 37,692.

This invention relates to cutting devices.

An object of the invention is to provide a cutting device moreparticularly adapted for cutting belting and other materials, wherein itis necessary to exert powerful pressure upon the cutting blade, in arelativelysmall and compact device.

Another object of the invention is ,to provide a cutting device of thischaracter n which a knife blade or cutting tool is arranged to haveoperative movement in longh tu-dinal and verticaldirections uponmanipulation of actuating means, said knife being mounted for operativemovement upon ,a support which is held stationary during the cuttingoperation, and which may be automatically bodily swung to an up'aised1noperative position while the belt or other material is being adjustedin the mach ne, together with safety means for preventing accidentaldescent of the knife support, and for securing the support in operativeposition, said means being auton'iatically operable during movement ofthe actuat ng means. 7

Another object of the invention is to provide a cutting apparatus ofthis character in which means are provided for imparting verticalmovement to the knife during its longitudinal movement, said meansincluding a cam arrangementin which anti-friction means are interposedbetween the cam elements in such a manner that the stresses aretransmitted directly through the body portions of the anti f1rictionelements, in contradistinction to devices in which the anti-frictionelements are supported upon pivot pins to which the powerful cuttingpressure is transmitted, with a consequent bending or distortion of thepivot pins which interferes with the operation of the apparatus.

Other objects and advantages of the invention will more fully andclearly appear from the description and'claims hereinafter following.

In the drawings Figure l is a top plan view of the invention, showingthe operating handle in raised position, and partially broken away.Figure 2 is a side elevation of the invention, showing the device aboutto begin the cutting operation. Figure 3 .is .a vertical longitudinalsectional view of the invention substantially on the line 33 of Figure1, and showing partly in section, and

partially in elevation, the cutting blade and c uatlng mechan sn'i.Figure-4L 1s, a vertical sectional view similar to Figure 3 showing ofFigure 3.

The invention broadly comprises a work support A, a knife support or arm13, a knife C, cam means D, actuating means E, locking device F, andsafety mechanism G.

The work holder or base A,-preferably comprises a horizontally disposedplatform 10, the ends of which are preferably formed integrally with endsupports 11 and 12, said platform being strengthened by means of avertically disposed longitudinally ext-ending rib 13 preferably formedintegrally with the platform and with the. end supports 11 and 12. Thesupport 12 preferably comprises spaced standards 14, the upper inner endsurfaces of the standards being rabbeted, as indicated at 15 for thereception of the knife carrying arm-B, and a pin 16 is mounted in saidstandards and extends therebetween,

for use in connection with the latch means -F on the knife carrying arm13, all of which vwill be hereinafter referred to. The for ward support11 is also provided with spaced standards 17, and mounted between suchstandards upon the pivot pin 18, is the knife carrying arm or support B.

The knife carrying support B preferably com-prises spaced side membersor walls19 and 20, the wall portion 19 prefera lyincluding forward andrear angular extensions 21 and 22 each of which abuts against the innerface of the wall 20, andis secured to such wall by suitablescrew bolts23. Securedt0 the undersurfaces of the extensions 21 and 22, preferablybycmeans of screw bolts 24, are cam blocks 25 and 26, the cam block 25being provided with an inclined undersurface 27, and the cam block 26being provided with an inclined surface 28 in a similar manner, the cambl cks 25 and 26 being alike in all respects, and of a width less thanthe distance. between the walls 19 and 20, so as to leave a space 29between --the adjacent face of each cam block and the wall 20. The camblock 25 is provided with a pin 30, and the cam block 26 is providedwith a similar pin 31, each of said pins extending transverselytherethrough, and projecting into the space 29 at the sides thereof, andupon the end of the pin 30, and of the pin 31, are mounted links 32 and33 respectively which are connected to the cutting blade C, each of thelinks 32 and 33 being provided with slots 34 and 35, through which theends of the pins 30 and 31 project as shown in the drawings, so as topivotally mount the links upon the blocks. and at the same time permit acertain amount of play in the connections.

The knife C is mounted upon a carrier bar 36, such carrier having arabbeted portion 37 adapted for the reception of the edge of the blade,the blade being secured to the carrier by means of screw bolts 33, whichproject outwardly from the blade and move in the runways 36 provided inthe wall 19 of the support B, such runways being out out as indicated at38 to afford access to the bolts 38. Mounted upon the carrier 36adjacent the ends thereof, and adapted to cooperate with the cam blocks25 and 26, are oppositely disposed cam blocks 39 and 40, such cam blocksbeing secured to the carrier 36 by means of screw bolts 41. The camblocks 39 and l0 have inclined. upper faces 42, the inclination thereofcorresponding to the inclination of the faces 27 and 28 of the blocks 25and 26, and such blocks are re duced for the reception of the oppositeends of the links 32 and 33, each of the cam blocks being provided witha pin 112 which projects through a slot -13 in each of the links 32 and33. Mounted between the cam surfaces of the cam blocks 25, 26. and 39and 40 are antifriction means, which are in the form of rollers 14, eachof the rollers being rotatably mounted upon a pin 15, fastened to thelinks 32 and 33, the rollers stelbeing adapted to engage the camsurfaces of the cam blocks, and by reason of the play permitted by theslots 3 and 43. it will be noted that during operation of the device thestresses are transmitted through the body portions of the rollers andnot to the pivot pins 15, said pins merely retaining the rollers inposition. The carrier 36 is further provided with an inclined guide slot16 the walls of which engage a roller 17 mounted upon a pin d3 fixedlysecured to the wall 20 of the support or frame 13, such arrangementacting to raise and lower the blade carrier and support the same duringits operation.

The actuating mechanism E for impart ing longitudinal movement to theknife and knife carrier, comprises a curved link 46 pivotally connectedto the knife carrier 36 by means of a pivot pin 17, the opposite ends ofthe link 4:6 being connected to a crank 1 8 by means of a pivot pin 19,such crank being mounted upon a pivot pin 50., and the crank in turn ispivotally connected between the arms of a bifurcated lever 51. The levermember 51 is provided with asocket for the reception of a handle 52, bywhich the lever member 51 is operated, and it will be appreciated thatmovement of the handle 52 will impart movement to the crank 48, and suchmovement will be communicated to the knife carrier 36 by the links 16,continued move ment of the handle 52 in a counter-clockwise directioncausing the lever 51 to come into contact with the end of the support B,and thereafter elevate the said support with reference to the holder 10as shown in Figure 6.

The automatic locking means F comprises a latch 53, which is pivotallymounted between the side members 19 and 20 on a pin 53 said latch beingprovided with a hooked end 5 1 adapted to engage the pin 16 between thestandards 1%, and having at its opposite end a cam surface 55 adapted toengage the surface of an arcuate cam 56 formed upon the link 33, therebeing a spring 57 connected to the wall of the support B which normallyurges the hooked portion 54 out of engagement with the pin 16, theoperation being such that when the handle 52 is moved in a'countenclockwise direction, due to the forward travel of the knifecarrier. the link 32 will be swung on its pivot causing the latch to bereleased, and when the lever reaches the position shown in Figure 3,where the lever member engages the end of the support B, the entireknife support B may be elevated to the position shown in Figure 6. Whenthe lever 52 is swung in a cutting direction, the cam 56 by engagementwith the cam surfaces 55 of the latch, forces the hooked portion 5 1thereof into engagement with the pin 16. TV hen the parts are at thelimits of the cutting movement the same may be locked in this positionby means of a hooked latch 58, and due to the shape of the support 13 anoffset portion 59 is provided. the lever in its latched position and theoffset portion providing a handle 60 by which the entire device may bemanually transported from place to place.

The safety means G are provided for the purpose of preventing theaccidental descent of the knife support B when the same is in upraisedposition, such means includinga member 61 pivotally mounted at theforward portion of the support 13, such member being normally urged in acounter-clockwise direction by means of the spring 62, preferablymounted on the pivot pin 18. The member 61 is provided with a shoulder63 adapt ed in certain positions of the parts to be engaged by theadjacent end 6% of the knife carrier the movement of the knife controlling the position of the member 61. The member 61 is adapted toco-operate with a rib 65 formed at the forward end of the platform 10,such rib being curved to provide a cavity 66, the end portion of themember 61 being inclined as shown at 67 to as: sure proper movement ofthe member 61 past the rib 65 during a certain phase of the operation ofthe device, the construction being such that when the handle 52 is movedsufliciently to tilt-the knife carrier B, the spring 62 urges the lowerend of the member '61 outwardly, and should the support B accidentallydescend, such descent will be checked by engagement of the member 61with the rib 65, so as to prevent injury to the operator. l/Vhen thelever 52 is operated to cause intentional descent of the support. B, theforward movement of the knife will-press the member 61 inwardly so as toclear the rib 65.

In operation when it is desired to cut a piece of material such asbelting, assuming the parts to be in the position shown in Figure 4, thelatch 58 is disconnected to release the handle 52, which is then swungin an anti-clockwise direction, raising the knife through the action ,ofthe crank 48, link 46, and the roller 47 engaging the inclined surfacesof the guide slot 46 such movement bringing the link 33 into an inclinedposi tion, causing the cam 56 to ride out of engagement with the camsurface 56 of the locking member F, whereupon the spring 57 will urgethe same in an anti-clockwise direction, as shown inFigure 3, todisengage the hooked portion 54 from the pin 16. Continued movement ofthe handle 52 in an anti-clockwise direction, due to the engage- .mentof the lever member 51 with the .end portion of the support B will causeelevation of the support about its pivot 18, the knife being entirelyretracted between the walls 19 and 20 of the support and the member 61held in retracted position byreason of the pressure exerted thereon bythe knife due to its forward position. Should the support B accidentallydescend with the lever in this position there would be no danger to theoperator since the knife is entirely retracted between the members 19and20 of the support B; however should the handle 52 be operated whilethe support is in an upraised position, the knife would be projectedfrom within the support B, the projection of the knife due to thearrangement 'esulting in its rearward movement which releases the member61, so that should the support fall, the member 61 will come incontactwith the rib 6 and prevent further descent. When the support B isin-upraised position the material to be cut may be placed upon theplatform and the handle .52 operated which will cause-the gradualdescent .of the support B with the handle 52 at the limit of itsanti-clockwise movement. During such descent, the member 61 will beheldin its inoperative position by engagement of the knife therewith untilit moves past therib -65. llVhen the support comes to rest upon therabibeted portions of the standards 14,

immediately upon further movement of the lever 52,the cam 28 will engagethe camsurface of the latch, F, and press the hooked portion 54 thereofinto engagement with the pin 16, so thatwhen the knife is performing itscutting operation, the support is securely locked to the platform andcan not be de tachedtherefrom during the cutting operation. Furthermovement of the handle 52 through the. crank 48 andjlinks 46causesfurther longitudinal movement of the cutter C, i

and due to the provision of the cam blooks25 and 26, the interposedrollers44, and guide means, the knife is caused to descend during thelongitudinal movement thereof, and this action continues until thematerial'is out. In this connection it is pointed out that due, to theparticular arrangement of the cam blocks and the antiefriction means,the pressure exerted upon the antifriction means is transmitted bodilytheret-hrough with .outbending or distortion .of trunnions or pivotsupon which the anti-friction means are mounted, which occurs in machinesof .ordinary construction.

lVhile I have herein shown and described between the cam elements onsaid support on said cutter, said anti-friction means being arranged totransmit the bearing stresses from one cam surface to the other. 3

2. In a cutting device, the combination with a work holder; a cuttersupport arranged ;to be connected ltO said work holder; cutting meansmeans for actuating said cutting means toward and from said work holder;and means for automatically disconnecting saidicutter support from saidwork holder upon certain movement of saidvactu- -ating means.

3. In a cutting device, the combination with a work holder; of a cuttersupport adapted to be connected to said work holder; cutting meansmounted on said cutter support; actuating means for causing advance andretract-ion of said cutting means with respect to said work holder; andmeans for automatically disconnecting said cutter support from said workholder upon retraction of said cutting .means.

4.JIn a vcutting device, the combination with a work holder; of a cuttersupport adapted to be connected to said work holder; cutting meansconnected to said cutter support; actuating means for operating saidcutting means, and for elevating said sup port with respect to said workholder; means for automatically disconnecting said support from saidwork holder upon certain movement of said actuating means, and means forpreventing the accidental descent of said cutter support.

5. In a cutting device, the combination with a work holder; of a. cuttersupport; cutting means; means for actuating said cutting means to causeadvance and retraction thereof; and means for automatically connectingand disconnecting said cutter support with reference to the work holder,dependent upon the advance and retraction of said cutting means.

6. In a cutting device, the combination with a work holder; of a cuttersupport; cutting means carried by said support; means for advancing orretracting said cutter relative to said work holder, said means beingarranged to permit elevation of said support with reference to said workholder; and safety means for preventing accidental descent of saidcutter support.

7. In a cutting device, the combination with a work holder; of a cuttersupport cooperating with said work holder; cutting means carried by saidsupport; means for effecting advance and retraction of said cuttingmeans relative to said work holder, said means being arranged to permitelevation of said cutter support; and safety means for preventingaccidental descent of said cutter support, said safety means beingarranged to be released by advance of said cutting means while saidsupport is in elevated position.

8. In a cutting device, the combination with a work holder; of a cuttersupport cooperating with said work holder; cutting means carried by saidsupport; means for effecting advance and retraction of said cut tingmeans relative to said work holder, said means being arranged to permitelevation of Said cutter support; safety means for'preventing accidentaldescent of said cutter support, said safety means being arranged to bereleased by advance of said cutting means while said support is inelevated position, said safety means being arranged to be held ininoperative position during intentional descent of the cutter support.

9. In a cutting device, the combination with a work holder; of a cuttersupport cooperating with said work holder; cutting means carried by saidcutter support; means for advancing and retracting said cutting meansrelative to said work holder; means for automatically connecting anddisconnecting said cutter support with reference to said work holderdependent upon the direction of movement of said cutting means; andsafety means operable to prevent accidental descent of said cuttersupport.

10. In a cutting device, the combination with a work holder; a cuttersupport; cutting means carried by said cutter support; actuating meansfor causing the advance and retraction of said cutting means, saidactuating means including inclined bearing members on said support andsaid cutting means; and anti-friction elements interposed between saidbearing members and adapted to transmit the bearing stresses to all ofsaid inclined bearing members.

11. In a cutting device, the combination with a work holder; a cuttersupport; cutting means carried by said cutter support; actuating meansfor causing the advance and retraction of said cutting means, saidactuating means including inclined bearing members on said support andsaid cutting means; anti-fricti0n elements interposed between saidbearing members and adapted to transmit the bearing stresses to all ofsaid inclined bearing members; and means for connecting and disconectingsaid support with respect to said work holder dependent upon thedirection of movement of said actuating means.

12. In a cutting device, the combination with a work holder; a cuttersupport; cutting means carried by said cutter support; actuating meansfor causing the advance and retraction of said cutting means, saidactuating means including inclined bearing members on said support andsaid cutting means; anti-friction elements interposed between saidbearing members and adapted to transmit the bearing stresses to all ofsaid inclined bearing members; means for connecting and disconnectingsaid support with respect to said work holder dependent upon thedirection of movement of said actuating means; and a safety device forpreventing accidental descent of said support from an upraised position.

13. In a cutting device, the combination with a work support; a cuttersupport; cutting means including elements connecting said cutting meansand said cutter support; means for imparting longitudinal movement tosaid cutting means; operatii'ig means for advancing and retracting saidcutter relative to said work holder during the longitudinal movement ofsaid cutting means, said operating means including inclined bearingsurfaces; and anti-friction elements interposed between said bearingsurfaces and adapted -to transmit the bearing stresses directly throughthe body portions thereof from one bearing surface to another.

14. In a cutting device, the combination with a cutting blade; ofoperating means for causing movement of said blade toward and from thematerial to be cut, said means including relatively movable parts; andanti-friction elements associated with said operating means andinterposed betweensaid movable parts and arranged to transmit thebearing stresses therebetween directly from one to the other.

15. In a cutting device, the combination with a work holder; of a cuttersupport including spaced walls; inclined bearing blocks mounted betweensaid Walls; a cutter provided with inclined bearing blocks; meansproviding a movable connection be tween said cutter support and saidcutter; anti-friction elements interposed between said bearing blocks;and means for imparting longitudinal movement to said cutter.

16. In a cutting device, the combination with a work holder; of a cuttersupport; inclined bearing blocks mounted onsaid support; a cutterprovided with inclined bearing blocks; means providing a movableconnection between said cutter support and said cutter; anti-frictionelements interposed between said bearing blocks; means for impartingmovement in a longitudinal direction to said cutter; a latch forconnecting said cutter support with said work holder; and cam meansassociated with said connecting means for detaching said latch from saidwork holder upon retraction of said cutter.

tudinal direction; a latch for connecting said cutter support with saidwork holder; cam means associated with said connecting means fordetaching said latch from said w rk holder upon retraction of saidcutter; and a safety member pivotally carried by said cutter support andnormally urged to operative position, said safety member beingcontrolled by the position of said cutter.

18. In a cutting device, the combination with a work holder; of a cuttersupport; cutting means; lost motion link connections between saidcutting means and said cutter support, said link connections carryingantifriction elements operating between said support and said cuttingmeans; and means for actuating said cutting means toward and from saidwork holder.

In witness that I claim the foregoing I have hereunto subscribed my namethis 4th day of June, 1925.

GEORGE E. PURPLE.

